wild card

American  

[wahyld-kahrd] / ˈwaɪldˌkɑrd /

Or wildcard

noun

1. Cards. a card having its value decided by the wishes of the players.

2. a determining or important person or thing whose qualities are unknown, indeterminate, or unpredictable.

   In a sailboat race the weather is the wild card.

3. Sports. an unranked or unproven player or team that is allowed to enter a tournament after regularly qualifying competitors have been selected.

   The committee added several retired champions as wild cards in the tennis championships.

4. Digital Technology. a symbol in a search parameter, usually the asterisk or question mark, that will retrieve all results for another character or other characters in its position.

   The file search is case-sensitive, and wildcards are not supported.

---

wild card British  

noun

1. See wild

2. sport a player or team that has not qualified for a competition but is allowed to take part, at the organizers' discretion, after all the regular places have been taken

3. an unpredictable element in a situation

4. computing a symbol that can represent any character or group of characters, as in a filename

---

wild card Idioms  

1. An unpredictable person or event, as in Don't count on his support—he's a wild card, or A traffic jam? That's a wild card we didn't expect. This expression comes from card games, especially poker, where it refers to a card that can stand for any rank chosen by the player who holds it. The term was adopted in sports for an additional player or team chosen to take part in a contest after the regular places have been taken. It is also used in computer terminology for a symbol that stands for one or more characters in searches for files that share a common specification. Its figurative use dates from the mid-1900s.

---

Etymology

Origin of wild card

First recorded in 1530–40

Example Sentences

Hutter is on the market after being sacked by Monaco in October, but he really would be a wild card.

From BBC

The wild card is air travel demand as U.S. and global economies absorb significantly higher energy prices, they wrote.

From Barron's

“The biggest wild card here is duration,” Romaine said.

From The Wall Street Journal

A potential wild card, of course, is the U.S. conflict with Iran.

From MarketWatch

Economic conditions remain a wild card for the rest of 2026 as investors parse how AI will reshape the labor market.

From MarketWatch